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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, October 28, 2011
Room 155, Chem-Phys Building

Dr. Dan Dessau
Department of Physics
University of Colorado, Boulder

"The Origin of Fermi Arcs in Cuprate High Temperature Superconductors''

The ``normal'', i.e. non-superconducting state of underdoped cuprate superconductors is an extremely unusual state of matter, widely argued to be more exotic and interesting than the high temperature superconducting state to which it is intimately linked. This normal state is characterized by a pseudogap corresponding to partially gapped portions of Fermi surface, and a ``Fermi arc'' typically described as a discontinuous locus of quasiparticle excitations in which for example electron cyclotron orbits would not be allowed. Here we show, via the introduction and application of a new type of quantitative photoemission-based spectroscopy, that most of the pseudogap and Fermi arc phenomenology is naturally explained as a consequence of the interplay of the temperature and doping dependence of a d-wave superconducting gap/pseudogap with a strong pair-breaking electronic scattering rate that is experimentally deconvolved for the first time.

Refreshments will be served in CP 179 at 3:15 PM